Thus far, AMH levels appear to be useful in differentiating non-obstructive azoospermia from obstructive azoospermia, anorchidism from cryptorchidism, and constitutive pubertal delay from congenital hypogonadotropic hypogonadism in prepubertal males (19). The gene discussed is AMH; the disease is hypogonadotropic hypogonadism.